package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.result.Result;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional(rollbackFor = Exception.class)
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据
        dishMapper.insert(dish);//后绪步骤实现

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        //获取口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);//后绪步骤实现
        }
    }

    //分页
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {

        //开启分页插件
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        //执行分页条件查询
        Page<DishVO> page = dishMapper.page(dishPageQueryDTO);//后绪步骤实现

        //封装pageresult

        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    public DishVO selectId(Long id) {
        //根据id查询菜品数据
        Dish select = dishMapper.select(id);

        //根据菜品id查询口味
        List<DishFlavor> flavors =  dishFlavorMapper.selectFlavor(id);

        //将查询的数据封装vo
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(select,dishVO);
        //获取口味
        dishVO.setFlavors(flavors);

        return  dishVO ;
    }

    @Override
    public void update(DishDTO dishDTO) {
        Dish dish = new Dish();
        //把数据复制到 dish
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品基本信息
        dishMapper.update(dish);
        //先删除原有口味信息 重新插入口味 口味n条
        dishFlavorMapper.deletByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();

        if (flavors!=null&& flavors.size()>0){
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));

            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Transactional
    @Override
    public void delete(List<Long> ids) {
        //判断当前菜品是否能够删除 是否存在起售中 的
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus()== StatusConstant.ENABLE){
                //当前菜品在起售中 不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
//        在dish表中删除菜品基本数据时，同时，也要把关联在dish_flavor表中的数据一块删除。 事务
//        setmeal_dish表为菜品和套餐关联的中间表。 判断是否关联
//        若删除的菜品数据关联着某个套餐，此时，删除失败。
//        若要删除套餐关联的菜品数据，先解除两者关联，再对菜品进行删除。

//        判断当前菜品是否能删除 是否被套餐关联
        List<Long> ssids = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (ssids!= null&& ssids.size()>0){
            //当前菜品被菜品关联 不能删
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);

        }
        //删除菜品表中的菜品数据
        for (Long id : ids) {
            dishMapper.deleteById(id);
            //删除菜品关联的口味数据
            dishFlavorMapper.deletByDishId(id);
        }
    }

    @Override
    public List<Dish> categoryId(Long categoryId) {

        return dishMapper.categoryId(categoryId) ;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectFlavor(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    @Override
    public void startOr(Integer status, Long id) {
        Dish dish = new Dish();
        dish.setStatus(status);
        dish.setId(id);
        dishMapper.update(dish);
    }
}
